Tagged Questions

I have a client who wants me to have 3 steps when a user signs up on our wordpress site.
On the first step..
There will be a domain availability checker. If the domain is available, they will proceed ...

Is there a clean way of doing so? I would prefer doing that in functions.php using some action and/ or filter hooks. The 2nd-best option would be using some good plugin out there. (I haven't seen 1 ...

I'm looking for an example wp-signup.php template for which to work with. I've done a search in Google but nothing from the past year comes up. :/
I've tried:
template-dir/registration/activity.php
...